:root {
  --bg: #f6f1e8;
  --bg-accent: #d9f7f6;
  --surface: rgba(255, 252, 246, 0.86);
  --surface-strong: rgba(255, 253, 249, 0.96);
  --ink: #142332;
  --ink-soft: #405465;
  --line: rgba(20, 35, 50, 0.12);
  --brand: #13d9df;
  --brand-deep: #0a7f8a;
  --brand-ink: #06242c;
  --shadow: 0 24px 60px rgba(7, 17, 29, 0.12);
  --radius-lg: 28px;
  --radius-md: 18px;
  --radius-sm: 12px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(circle at top left, rgba(19, 217, 223, 0.18), transparent 28%),
    radial-gradient(circle at top right, rgba(7, 17, 29, 0.1), transparent 24%),
    linear-gradient(180deg, #fff9ef 0%, var(--bg) 100%);
  font-family: "Manrope", "Noto Sans SC", sans-serif;
  line-height: 1.7;
}

a {
  color: var(--brand-deep);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

img {
  max-width: 100%;
  height: auto;
}

[data-lang] {
  display: none;
}

body[data-active-lang="en"] [data-lang="en"],
body[data-active-lang="zh"] [data-lang="zh"] {
  display: initial;
}

body[data-active-lang="en"] p[data-lang="en"],
body[data-active-lang="en"] div[data-lang="en"],
body[data-active-lang="en"] section[data-lang="en"],
body[data-active-lang="en"] article[data-lang="en"],
body[data-active-lang="en"] li[data-lang="en"],
body[data-active-lang="en"] span[data-lang="en"],
body[data-active-lang="en"] a[data-lang="en"],
body[data-active-lang="en"] h1[data-lang="en"],
body[data-active-lang="en"] h2[data-lang="en"],
body[data-active-lang="en"] h3[data-lang="en"],
body[data-active-lang="en"] h4[data-lang="en"],
body[data-active-lang="zh"] p[data-lang="zh"],
body[data-active-lang="zh"] div[data-lang="zh"],
body[data-active-lang="zh"] section[data-lang="zh"],
body[data-active-lang="zh"] article[data-lang="zh"],
body[data-active-lang="zh"] li[data-lang="zh"],
body[data-active-lang="zh"] span[data-lang="zh"],
body[data-active-lang="zh"] a[data-lang="zh"],
body[data-active-lang="zh"] h1[data-lang="zh"],
body[data-active-lang="zh"] h2[data-lang="zh"],
body[data-active-lang="zh"] h3[data-lang="zh"],
body[data-active-lang="zh"] h4[data-lang="zh"] {
  display: block;
}

body[data-active-lang="en"] span[data-lang="en"],
body[data-active-lang="en"] a[data-lang="en"],
body[data-active-lang="zh"] span[data-lang="zh"],
body[data-active-lang="zh"] a[data-lang="zh"] {
  display: inline;
}

.site-shell {
  position: relative;
}

.site-backdrop {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(circle at 15% 20%, rgba(19, 217, 223, 0.12), transparent 20%),
    radial-gradient(circle at 85% 10%, rgba(8, 32, 43, 0.12), transparent 24%);
}

.site-header,
.page-wrap,
.site-footer {
  position: relative;
  z-index: 1;
}

.site-header {
  padding: 28px 20px 16px;
}

.site-header__inner,
.page-wrap,
.site-footer__inner {
  width: min(1100px, calc(100% - 32px));
  margin: 0 auto;
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.site-brand {
  display: flex;
  align-items: center;
  gap: 14px;
  color: inherit;
}

.site-brand:hover {
  text-decoration: none;
}

.site-brand__logo {
  border-radius: 18px;
  box-shadow: 0 16px 24px rgba(7, 17, 29, 0.14);
}

.site-brand__text {
  display: grid;
  gap: 2px;
}

.site-brand__title {
  font-size: clamp(1.15rem, 1rem + 0.7vw, 1.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
}

.site-brand__subtitle {
  color: var(--ink-soft);
  font-size: 0.94rem;
}

.lang-switcher {
  display: inline-flex;
  padding: 4px;
  border: 1px solid rgba(7, 17, 29, 0.1);
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.76);
  backdrop-filter: blur(12px);
  box-shadow: 0 14px 28px rgba(7, 17, 29, 0.08);
}

.lang-switcher__button {
  border: 0;
  border-radius: 999px;
  background: transparent;
  color: var(--ink-soft);
  padding: 10px 14px;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.lang-switcher__button[aria-pressed="true"] {
  background: linear-gradient(135deg, var(--brand) 0%, #8bf2ee 100%);
  color: var(--brand-ink);
}

.page-wrap {
  padding: 16px 0 56px;
}

.hero-card,
.article-shell,
.post-card {
  background: var(--surface);
  border: 1px solid rgba(255, 255, 255, 0.6);
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.hero-card,
.article-shell {
  border-radius: var(--radius-lg);
}

.hero-card {
  overflow: hidden;
}

.hero-card__body,
.article-shell {
  padding: clamp(24px, 4vw, 42px);
}

.hero-card__body h1,
.hero-card__body h2,
.hero-card__body h3,
.article-content h1,
.article-content h2,
.article-content h3,
.article-content h4 {
  font-family: "Noto Serif SC", Georgia, serif;
  line-height: 1.2;
  letter-spacing: -0.03em;
}

.hero-card__body p,
.article-content p,
.article-content li,
.post-card__excerpt,
.article-hero__excerpt {
  color: var(--ink-soft);
}

.posts-section {
  margin-top: 28px;
}

.section-heading {
  margin-bottom: 18px;
}

.section-heading h2 {
  margin: 0;
  font-size: clamp(1.4rem, 1.15rem + 1vw, 2rem);
}

.section-heading p {
  margin: 8px 0 0;
  max-width: 760px;
  color: var(--ink-soft);
}

.post-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
}

.post-card {
  padding: 22px;
  border-radius: var(--radius-md);
}

.post-card__date {
  margin: 0 0 10px;
  color: var(--ink-soft);
  font-size: 0.92rem;
}

.post-card__title {
  margin: 0 0 12px;
  font-size: 1.18rem;
  line-height: 1.3;
}

.post-card__excerpt {
  margin: 0 0 16px;
}

.post-card__link {
  font-weight: 800;
}

.article-hero {
  margin-bottom: 28px;
}

.article-hero__meta {
  margin: 0 0 8px;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-size: 0.85rem;
  color: var(--brand-deep);
}

.article-hero__title {
  margin: 0;
  font-size: clamp(2rem, 1.4rem + 2.4vw, 3.6rem);
  line-height: 1.02;
}

.article-hero__excerpt {
  margin: 16px 0 0;
  max-width: 820px;
  font-size: 1.05rem;
}

.prose {
  font-size: 1.03rem;
}

.prose > :first-child {
  margin-top: 0;
}

.prose hr {
  border: 0;
  border-top: 1px solid var(--line);
  margin: 2rem 0;
}

.prose blockquote {
  margin: 1.5rem 0;
  padding: 0.1rem 1.2rem;
  border-left: 4px solid var(--brand);
  background: rgba(19, 217, 223, 0.08);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  background: var(--surface-strong);
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: block;
  overflow-x: auto;
}

.prose th,
.prose td {
  padding: 0.8rem 0.95rem;
  border-bottom: 1px solid var(--line);
  text-align: left;
}

.prose figure,
.prose img {
  border-radius: var(--radius-sm);
}

.prose img {
  box-shadow: 0 18px 32px rgba(7, 17, 29, 0.12);
}

.article-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--line);
}

.article-nav__item {
  flex: 1 1 240px;
  padding: 14px 16px;
  border-radius: var(--radius-sm);
  background: rgba(19, 217, 223, 0.08);
  font-weight: 700;
}

.article-nav__item--next {
  text-align: right;
}

.site-footer {
  padding: 0 20px 40px;
}

.site-footer__inner {
  padding: 20px 0 0;
  border-top: 1px solid rgba(20, 35, 50, 0.12);
  color: var(--ink-soft);
}

.site-footer__inner p {
  margin: 0 0 8px;
}

@media (max-width: 720px) {
  .site-header {
    padding-top: 18px;
  }

  .site-header__inner {
    align-items: flex-start;
    flex-direction: column;
  }

  .article-nav__item--next {
    text-align: left;
  }
}